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Potential influence of water level changes on energy flows in a lake food web

Wang, Yuyu; Yu, XiuBo; Li, WenHua; Xu, Jun LU ; Chen, YuWei and Fan, Na (2011) In Chinese Science Bulletin 56(26). p.2794-2802
Abstract
Large seasonal water-level fluctuations may influence isotopic signatures of primary producers and the types and amounts of these potential food sources accessible to aquatic fauna of Poyang Lake, the largest freshwater lake in China. In this study, the isotopic signatures of primary producers and consumers were determined, stable carbon and nitrogen isotope analysis and mixing models were combined to investigate the influence of water levels on the diet and isotopic composition of Poyang Lake fish and invertebrates. Five potential food sources (seston, benthic organic matter, aquatic macrophytes, attached algae, and terrestrial plants), 4 species of invertebrates, and 10 species of fish were collected from the lake area during dry and wet... (More)
Large seasonal water-level fluctuations may influence isotopic signatures of primary producers and the types and amounts of these potential food sources accessible to aquatic fauna of Poyang Lake, the largest freshwater lake in China. In this study, the isotopic signatures of primary producers and consumers were determined, stable carbon and nitrogen isotope analysis and mixing models were combined to investigate the influence of water levels on the diet and isotopic composition of Poyang Lake fish and invertebrates. Five potential food sources (seston, benthic organic matter, aquatic macrophytes, attached algae, and terrestrial plants), 4 species of invertebrates, and 10 species of fish were collected from the lake area during dry and wet seasons between January 2009 and April 2010. The delta C-13 values of invertebrates and most fish were within the range of delta C-13 values of the potential food sources for both seasons. The delta C-13 values of invertebrates and most fish were lower in the dry season than in the wet season, whereas the delta N-15 values exhibited different patterns for different species. Mixing models indicated that the most important food sources for common lake fauna were seston in the dry season and aquatic macrophytes and terrestrial plants in the wet season. The fauna were more omnivorous in the wet season than in the dry season. The food web dynamics of Poyang Lake are strongly influenced by changes in the abundance and accessibility of different basal food sources that occur because of seasonal flood pulses. The trophic links within the aquatic communities of Poyang Lake are modified by water-level fluctuations. (Less)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
keywords
stable isotopes, seasonal food sources, IsoSource model, water level, Poyang Lake
in
Chinese Science Bulletin
volume
56
issue
26
pages
2794 - 2802
publisher
Science China Press
external identifiers
  • wos:000294216000005
  • scopus:80051997976
ISSN
1001-6538
DOI
10.1007/s11434-011-4649-y
language
English
LU publication?
yes
id
28cad19c-880f-4d9e-b521-2c05d593fbe4 (old id 2161467)
date added to LUP
2011-09-21 13:11:38
date last changed
2017-09-10 04:11:51
@article{28cad19c-880f-4d9e-b521-2c05d593fbe4,
  abstract     = {Large seasonal water-level fluctuations may influence isotopic signatures of primary producers and the types and amounts of these potential food sources accessible to aquatic fauna of Poyang Lake, the largest freshwater lake in China. In this study, the isotopic signatures of primary producers and consumers were determined, stable carbon and nitrogen isotope analysis and mixing models were combined to investigate the influence of water levels on the diet and isotopic composition of Poyang Lake fish and invertebrates. Five potential food sources (seston, benthic organic matter, aquatic macrophytes, attached algae, and terrestrial plants), 4 species of invertebrates, and 10 species of fish were collected from the lake area during dry and wet seasons between January 2009 and April 2010. The delta C-13 values of invertebrates and most fish were within the range of delta C-13 values of the potential food sources for both seasons. The delta C-13 values of invertebrates and most fish were lower in the dry season than in the wet season, whereas the delta N-15 values exhibited different patterns for different species. Mixing models indicated that the most important food sources for common lake fauna were seston in the dry season and aquatic macrophytes and terrestrial plants in the wet season. The fauna were more omnivorous in the wet season than in the dry season. The food web dynamics of Poyang Lake are strongly influenced by changes in the abundance and accessibility of different basal food sources that occur because of seasonal flood pulses. The trophic links within the aquatic communities of Poyang Lake are modified by water-level fluctuations.},
  author       = {Wang, Yuyu and Yu, XiuBo and Li, WenHua and Xu, Jun and Chen, YuWei and Fan, Na},
  issn         = {1001-6538},
  keyword      = {stable isotopes,seasonal food sources,IsoSource model,water level,Poyang Lake},
  language     = {eng},
  number       = {26},
  pages        = {2794--2802},
  publisher    = {Science China Press},
  series       = {Chinese Science Bulletin},
  title        = {Potential influence of water level changes on energy flows in a lake food web},
  url          = {http://dx.doi.org/10.1007/s11434-011-4649-y},
  volume       = {56},
  year         = {2011},
}